Transcript L13-16 MundellFlemin..

The Mundell-Fleming Model
How international capital mobility alters
the effects of macroeconomic policy
Lecture 13:
Mundell-Fleming model with a fixed exchange rate
• Fiscal expansion
• Monetary expansion
• Automatic mechanisms of adjustment
Lecture 15: Practical policymaking problems
Lecture 16:
Mundell-Fleming model with a floating exchange rate
Lecture 17:
Mundell-Fleming model with perfect capital mobility
The Mundell-Fleming equations with a fixed exchange rate
IS: Y =
𝐴 − 𝑏𝑖 + 𝑋−𝑀
𝑠+𝑚
LM:
IS
𝑀1
=
𝑃
L(i, Y)
LM
i
Y
ITF 220 Prof.J.Frankel
The Mundell-Fleming equations with a fixed exchange rate, continued
IS
LM
BP=0
i
Y
BP = TB + KA
New addition: capital flows
respond to interest rate differential
TB = 𝑋−𝑀 − mY
BP=0:
KA = 𝐾𝐴 + κ (𝑖−𝑖 ∗)
𝑋- 𝑀 − mY + 𝐾𝐴 + κ 𝑖−𝑖 ∗ = 0
Solve for interest differential:
(i-i*) =
1
κ
ITF 220 Prof.J.Frankel
[(−𝐾𝐴−(𝑋−𝑀)] +
𝑚
( )Y.
κ
(i-i*) =
BP=0:
1
κ
[(−𝐾𝐴 − 𝑋−𝑀 ]
+
𝑚
( )Y
κ
.
The slope is (m/𝜿).
κ=0
i
𝜿>0
i
BP=0
𝜿 >> 0
i
BP=0
BP=0
Y
Y
Y
Capital mobility gives some slope to the BP=0 line:.
A rise in income and the trade deficit is consistent with BP=0 …
if higher interest rates attract a big enough capital inflow.
ITF 220 Prof.J.Frankel
κ=0
𝜿>0
BP=0
BP=0
•
•
Experiment: Fiscal expansion.
𝜿 >> 0
BP=0
•
The capital inflow is either
less than enough to give a surplus in the overall balance of payments,
or more than enough, depending on the degree of capital mobility.
ITF 220 Prof.J.Frankel
𝜿 low
𝜿 high
•
•
Example: France 1981.
The Mitterrand fiscal expansion
did not attract enough capital
inflow to finance fully the TD.
Example: Germany, 1990-91.
The Unification fiscal expansion
attracted more than enough
capital inflow to finance TD.
ITF 220 Prof.J.Frankel
κ=0
•
𝜿>0
•
Experiment: Monetary expansion
𝜿 >> 0
•
A capital outflow
=>TB ↓
adds to BoP deficit.
The overall balance of payments deficit is bigger, the bigger is k.
ITF 220 Prof.J.Frankel
Automatic mechanisms of adjustment
1. Money supply (via reserve flows)
2. Exchange rate (via demand for currency)
3. Price level (via excess demand for goods)
4. Indebtedness
(via current account or budget deficit)
ITF 220 Prof.J.Frankel
1st automatic mechanismofadjustment:
Reserveflows
(MABP)
k low
k high
•
•
If outflow is sterilized, economy remains at point M.
If unsterilized, money flows out – – faster and faster as k is higher.
≡ “Offset” to monetary expansion.
ITF 220 Prof.J.Frankel
A 2nd automatic mechanism of adjustment:
Floating exchange rate
• If, at a given exchange rate, a country would have a BoP
deficit, then under floating the currency depreciates.
– Enhanced competitiveness (=> 𝑋 ↑) shifts IS & BP=0 curves right.
– Equilibrium occurs at:
• a higher level of Y.
• BP=0.
• If, at a given exchange rate, a country would have a BoP
surplus, then under floating the currency appreciates.
– Uncompetitiveness (=> 𝑋 ↓) shifts both the IS & BP=0 curves left.
– Equilibrium occurs at:
• a lower level of Y.
• BP=0.
• as we will see in Lecture 16.
ITF 220 Prof.J.Frankel
Appendix:
Mundell-Fleming model illustrated by
the example of BoP surpluses
in Emerging Markets
• (1) Causes of surpluses
– 1990-97
– 2003-12
• (2) Alternative ways to manage inflows.
ITF 220 Prof.J.Frankel
(1) Causes of BoP Surpluses in EM Countries
I.
“Pull” Factors (internal causes)
1. Monetary stabilization
=> LM shifts up
2. Removal of capital controls => κ rises
3. Spending boom
=> IS shifts out/up
e.g., 1990-97
II.
“Push” Factors (external causes)
1.
Low interest rates in rich countries
=> i* down =>
2.
Boom in export markets =>
•
}
BP
shifts
down
/out
Causes of BoP Surpluses in EM countries
2003-08 & 2010-12
• Strong economic performance (especially China & India)
-- IS shifts right.
• Easy monetary policy in US and other
major industrialized countries (low i*)
-- BP shifts down.
• Big boom in mineral & agricultural commodities
(esp. Africa & Latin America)
-- BP shifts right.
(2) Alternative ways
of managing inflows:
i
•
A country at point B
has a BoP surplus.
Y
A. Allow money to flow in
(can be inflationary)
B. Sterilized intervention
(can be difficult)
C. Allow currency to appreciate (lose competitiveness)
D. Reimpose capital controls
(can impede efficiency)
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(Each way
has a
drawback.)
China initially took its BoP surplus as fx reserves.
But it also allowed RMB appreciation (2006-12).
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Lecture 15: Problems/Applications
of discretionary policymaking
1. Targets & instruments revisited
2. Practical difficulties
of policymaking
3. Zero Lower Bound
• Appendix: The case of China’s inflows 2003-12
1. Targets & instruments revisited
• When we first showed the need to have
as many independent policy instruments as goals,
monetary & fiscal policy were not independent.
• Now, with capital mobility, they have somewhat
independent effects on external balance,
provided it is defined as BP=0 (rather than just TB=0).
• The reason: they have opposite effect on capital flows,
because they have opposite effects on interest rates.
• => Even with a fixed exchange rate, the proper
combination of monetary & fiscal policy can
attain internal & external balance at the same time.
ITF-220 - Prof.J.Frankell
In theory, there exists a precise mix of monetary & fiscalpolicy
that will hit both internal balance and BP=0.
Y=𝒀
TB=0
i
●
LM
●
BP=0
TD balanced by KA surplus
LM'
IS'
IS
Y
ITF-220 - Prof.J.Frankell
2. Practical difficulties of policymaking
Lags: between the change in a policy instrument
and the response in the economy
Uncertainty with regard to:
• the current position of the economy (“baseline”);
• future disturbances (“shocks”);
• the correct model (e.g., multipliers).
Expectations on the part of the public
Political Constraints
3. Liquidity trap or “Zero Lower Bound”
Does monetary policy lose effectiveness?
LM
i
LM’
IS
Y
• ZLB: Increases in the money supply by the central
bank are absorbed without further lowering i ,
the short-term rate.
•
•
E.g., Japan in late 1990s.
US, UK, ECB 2008-16.
ITF-220, Prof.J.Frankel
Liquidity trap or Zero Lower Bound, continued
• But central banks can still have effects via other channels:
•
•
Exchange rate depreciation
Boosting asset prices:
•
•
Raising expected inflation,
•
•
equities & real estate
thus lowering the real interest rate
Lowering the long-term interest rate.
• Especially via some “unconventional” tools:
• Quantitative Easing
• Forward guidance.
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End of Lecture 15:
Problems/Applications
of discretionary policymaking
Appendix:
China’s inflows, 2003-12,
including attempts to sterilize them, continued
ITF-220 - Prof.J.Frankell
Recall that China ran large BoP surpluses after 2003.
=> R rising every year.
at an increasing rate.
http://viableopposition.blogspot.com/2012/03/chinas-holdings-of-us-treasuries-what.html
API-120 - Prof. J.Frankel, Harvard
http://qz.com/171645/the-invisible-man-managing-chinas-3-8-trillion-in-reserves-just-stepped-down
The People’s Bank of China sold sterilization bills,
taking cash RMB out of circulation (dNDA/dt < 0)
and so counteracted increases in Net Foreign Reserves.
Source: Zhang, 2011,
Fig.7, p.47.
In 2007-08 China had more trouble
sterilizing the reserve inflow than in 2004-06.
• PBoC began to have to pay
higher domestic interest rates
– and to receive lower interest rate on US T bills
– => “quasi-fiscal deficit” or “negative carry.”
• Inflation became a serious problem in 2007-08.
• Also a “bubble” in the Shanghai stock market.
API-120 - Prof. J.Frankel, Harvard
The sterilization showed up as a steadily rising
share of foreign reserves (vs. domestic assets)
in the holdings of the People’s Bank of China
Chang, Liu & Spiegel, 2015, “Capital Controls and Optimal Chinese Monetary Policy” FRB SF WP 2012-13
Fig. 1, p.26
Sterilization eventually faltered:
Money accelerated sharply in 2007-08.
Real growth > 10% in 2007-08
Growth > 10%
China’s CPI accelerated in 2007-08.
Inflation 1999 to 2008
Source: HKMA, Half-Yearly Monetary and Financial Stability Report, June 2008
API-120 - Prof. J.Frankel, Harvard
2007-08 bubble in China’s stock market
Data from EconStatsTM, Reuters, and major online news outlets such as the BBC & NYT.
The PBoC raised required reserve ratio for banks, continued
Source: Zhang, 2011, Fig.6, p.46.
ITF-220 - Prof.J.Frankell
China was hit by the 2009 global recession
temporarily ending any problem of excessive monetary expansion.
2005-July 2015
Chinese government investment spending in 2009
counteracted the recession.
}
A rise in public
investment offset
the loss of export
demand in 2009.
Reserve Bank of Australia
China’s inflation broke sharply in 2008-09,
But took off again in 2010-11.
Inflation 2001 to 2011
API-120 - Prof. J.Frankel, Harvard
China’s housing prices also took off again in 2013.
Rate of increase of housing prices
in 4 major Chinese cities (year-on-year)
Source: Gwynn Guilford — Sept. 6, 2013
36
Lecture 16: Mundell-Fleming model
with a floating exchange rate
• Rule: if result at a given exchange rate would be a BoP
deficit, then result under floating is currency depreciation.
• Implications of capital mobility
• Monetary expansion: high κ => extra stimulus via net exports
=> more effect on Y.
• Fiscal expansion: high κ => crowding out of net exports
=> less effect on Y.
• Examples:
– Monetary expansion (Japan 2013, ECB 2015)
– & contraction (UK 1980, US 1980, Japan 1990)
– Fiscal expansions (US twin deficits in early 1980s)
ITF220 - Professor J.Frankel
Example of monetary expansion (1):
Abenomics depreciated the yen, 2012-2013
House of Representatives
dissolved, Nov. 2012
=> “Abenomics”
=
Y/$
Takatoshi Ito, Dec.30, 2013 , ADB Institute
http://www.asiapathways-adbi.org/2013/12/abenomics-progress-prospects-and-how-the-2020-tokyo-olympics-can-help-solve-japans-debt-problem/
Example of monetary expansion (2):
When ECB chief Mario Draghi announced QE Jan.22, 2015,
=> the euro depreciated.
$/€
ITF220 - Professor J.Frankel
The Mundell-Fleming equations when the exchange rate changes
IS: Y =
BP=0:
i
IS
𝐴 − 𝑏𝑖 +𝑋(E)
𝑠+𝑚
(i-i*) = -
𝑀1
LM:
= L(i, Y)
𝑃
1
κ
[(𝐾𝐴+𝑋(E)] +
IS'
•
•
𝑚
( )Y.
κ
LM
BP=0
BP'=0
A depreciation (rise in E)
raises net exports & so shifts
both the IS & BP curves
to the right,
assuming the MarshallLerner condition holds.
ITF 220 Prof.J.Frankel
Y
Monetary Expansion
κ=0
••
κ>0
•
•
κ >> 0
•
•
i ↓ => capital outflow => more depreciation => higher net exports
ITF220 - Professor J.Frankel
Fiscal Expansion
κ=0
κ>0
κ >> 0
•
•
••
••
i ↑ => capital inflow => less depreciation => lower net exports
ITF220 - Profe J.Frankel
Examples of monetary contractions
under modern conditions of high κ and floating exchange rates
• Thatcher monetary contraction of 1979-82
• Volcker monetary contraction of 1981-82
• Japanese monetary contraction of 1990-92
i
In each case,
i ↑, r↑ (at A)
LM'
IS’
IS
LM
=>currency appreciated
=> net exports fell (B)
A
=> recession was more
severe than in
traditional monetary
tightenings.
B
y
ITF220 - Professor J.Frankel
Examples of
i
monetary/
fiscal mix:
1) Reaganomics,
1981-84;
2) German
union
1991-92.
LM′
LM
•
1984
1982
•
M
contraction
•
Late
1970s
IS′′
IS′
IS
Y
The US shift in monetary-fiscal mix:
from low real interest rate & low $ in the late 1970s,
to high real interest rate & high $ in the mid-1980s.
GDP composition shifts to G & C, away from I & X-M.
ITF220 - Professor J.Frankel
We now have a causal interpretation of the twin deficits
US National Saving, Investment, & Current Account as Shares of GDP,
1949-2009
Trend:
Gap widened,
as NS fell
relative to I
Appendix: Japanese monetary
expansion and yen depreciation
2012-15
“Abenomics”
QE: The Fed doubled the monetary base in 2008.
Kuroda in Apr. 2013 announced BoJ would double over 2 years.
“HSBC: don’t worry, BoJ expansion will offset end of QE,” FT, Jun 14, 2013. http://blogs.ft.com/beyond-brics/2013/06/14/hsbc-dont-worry-boj-expansion-will-offset-end-of-qe/
Japan’s monetary easing (QQE)
raised the exchange rate (Yen/$) and stock market
HR dissolved,
Nov. 2012 =>
“Abenomics”
“Outlook 2014 - Recovery on a shaky footing,” Special , Economic Research Dept., Rabobank November 13, 2013, https://economics.rabobank.com/publications/2013/november/outlook-2014-recovery-on-a-shaky-footing/
Abenomics seemed to boost growth, at first.
But Japan went back into recession in 2014 Q2,
perhaps because of a big increase in the consumption tax
Nov. 2012 =>
“Abenomics”
April 2014 =>
Consumption tax
ITF220 - Professor J.Frankel
End of Lecture 16:
Mundell-Fleming model
with a floating exchange rate